# HEADERS ### Property description Setting up the Headers information by adding any desired number of keys and their values.
Setting headers as a constants
Setting constant headers keys
*If required, headers keys and defining their values can be mapped as an object.*
ƒx (String): Required string header
ƒx (Expression): fileHeader is set up as a function variable
### State Setting up headers for outgoing form. ### Value types ### Availability [File Upload](/reference-guide/components-list/file-upload.md) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.adapptio.com/reference-guide/properties/headers.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.